September weather forecast
Baucau, East Timor

As September sets in, the prolonged dry period gradually starts transitioning to the wet season once again. Baucau's weather in September, however, is typified by sun-drenched days marked by increased sunshine hours. The UV index is consistently high and requires careful safeguarding against excessive sun exposure. Sea temperatures return to their annual high, providing excellent conditions for water-based activities. Despite this returning trend towards the tropical monsoon climate, September remains essentially dry.

Temperature

Baucau's shift into September sets the average high-temperature at a still warm 29.4°C (84.9°F), a figure that deviates only slightly from August's 28.2°C (82.8°F). The nighttime temperature, during September, averages of 18.5°C (65.3°F).

Heat index

In September, the average heat index is evaluated at a hot 31°C (87.8°F). If one persists in activity during exposure, it could induce weariness and subsequently, heat cramps.
Bear in mind that the heat index values are determined for shaded areas and light breezes. Heat index values may rise by up to 15 Fahrenheit (8 Celsius) degrees when exposed to direct sunlight.
Note: The heat index, also known as 'felt air temperature' or 'apparent temperature', represents the fusion of temperature and moisture in the air to suggest how warm it feels. The influence of weather can be personal, changing with an individual's body mass, height, and level of physical exertion. Be aware that direct exposure to sunlight increases heat impact and may raise the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly important for children. Young individuals usually face greater risks than adults as their sweat production is less. Also, their larger skin surface relative to their small bodies and the high heat generation due to their activity contributes to their vulnerability.

Humidity

The least humid month is September, with an average relative humidity of 55%.

Rainfall

September is the month with the least rainfall, with 5mm (0.2") of accumulated precipitation.

Sea temperature

July through September, with an average sea temperature of 27°C (80.6°F), are months with the coldest seawater.
Note: Temperatures between 25°C (77°F) and 29°C (84.2°F) are ideal for swimming, diving, and similar water activities, ensuring pleasure and comfort for extended periods without feeling uneasy.

Daylight

The average length of the day in September is 12h and 4min.
On the first day of September, sunrise is at 06:35 and sunset at 18:32. On the last day of the month, sunrise is at 06:18 and sunset at 18:29 +09.

Sunshine

The average sunshine in September is 10h.

UV index

The months with the highest UV index are January through April, August through December, with an average maximum UV index of 12. A UV Index value of 11, and more, symbolizes an ultimate health vulnerability from unsafe exposure to UV radiation for the average person.
Note: In September, the maximum UV index of 12 suggests this advice:
Put into action all important safeguards, unprotected skin may burn swiftly. Remember that the sun's UV radiation is strongest between 10 a.m. and 4 p.m. Make an effort to avoid direct sun exposure during these hours. A wide-brimmed hat is a shield, deflecting up to 50% of harmful UV radiation from eyes. Even on overcast days, apply and frequently reapply a sunscreen with SPF 30 or more, specifically after a swim or outdoor workout. Alert! The Sun's UV rays are heightened by the reflection of sand and water.